Golf footwear traction elements

ABSTRACT

The invention generally relates to footwear for golf, and particularly to a footwear system for improved athletic performance. The invention provides a footwear system for golfers in which shoe-cushioning elements and sock-cushioning elements interact to prevent slippage between a golfer and the ground. Cushioning elements are arranged according to precision measurements of maximal stresses that occur between the sole of the feet and the ground at different moments throughout a golfer&#39;s swing. Using a system of the invention, a golfer avoids unpredictable slippage during each shot and also positions their feet consistently shot-after-shot, with the result that ball travel is commensurate with club choice and physical abilities.

FIELD OF THE INVENTION

The invention generally relates to footwear for golf, and particularly to a footwear system for improved athletic performance.

BACKGROUND

When a golfer takes a shot, he or she hits a golf ball with a golf club and propels the ball forward. The golfer typically hopes that the shot will send the ball to a certain place. Golfers know that a successful shot depends on both club choice and skill. Unfortunately, some golfers—even when using the best clubs—do not make the shots that they desire. Even the most skilled golfers sometimes make disappointing shots.

What is particularly bedeviling is that results can be inconsistent. When a golfer makes a shot that is, for all purposes, the same as a shot they made earlier in the same day, the ball sometimes travels a different distance or a different direction. Even where the golfer knows that they are repeating the same physical motions—the same muscle contractions with the same club in the same weather on the same day—the behavior of the golf ball is unpredictable. As a result, scores suffer. Not only are the poor scores a source of frustration and displeasure to golfers, but the unpredictability itself can be very vexing.

The fact that golfers experience such vexatious and frustrating phenomena is a significant problem facing golfers.

SUMMARY

The invention provides a footwear system for golfers in which shoes contain elements for padding and traction and socks contain elements for padding and traction, and those elements interact to prevent fatigue as well as slippage between a golfer and the ground. Padding and traction elements are arranged according to precision measurements of maximal stresses that occur between the sole of the feet and the ground at different moments throughout a golfer's swing. Sock and shoe elements interact to provide traction that opposes lateral stresses while providing cushioning that relieves discomfort associated with compressive stresses. Since discomfort is relieved at just those spots in which a golfer experience maximal compressive stresses, the golfer does not make continuous or subconscious adjustments of their foot positioning throughout the day. Since the padding and traction elements are positioned precisely according to measurements of stress during a golf swing, a golfer experiences maximal comfort by repeatedly positioning their feet consistently in the same way continually shot-after-shot and day-after-day. By providing a system that incorporates interacting elements into both socks and shoes, lateral motions between the foot and the ground are prevented. Since lateral motions between the foot and the ground are prevented just at those spots of maximal stress, the golfer plus the Earth form a single mass transferring momentum to the golf ball, giving much more predictable, consistent results than a golfer that slips, relative to the Earth. Using a system of the invention, a golfer avoids unpredictable slippage during each shot and also positions their feet consistently shot-after-shot, with the result that ball travel is commensurate with club choice and physical abilities. Thus the golfer enjoys the rewarding experience that, as their athletic abilities improve, their scores improve. Their experiences on the course are predictable and pleasurable and golfers can focus on getting the best performance from their clubs.

The invention includes the insight that stress between a golfer's feet and the ground can be dynamic and asymmetrical and influenced by the golfer's choice of footwear. The invention includes models of compressive and shear stresses as distributed across both of a golfer's feet during a shot. The invention provides templates for footwear systems that incorporate the stress models. A template of stress patterns can be used to provide a sock with cushioning elements, a shoe with cushioning elements, a shoe insole with cushioning elements, or a combination thereof. Because compressive and shear stresses may be non-uniformly distributed across the sole of a foot and asymmetrically distributed between a pair of feet, a template and footwear made accordingly avoids the positioning of non-useful elements in spots where they would not provide benefit and could instead increase discomfort, provide adverse biofeedback incentives, decrease tactile information specificity, or interfere with other material functions such as stretching or breathing. Accordingly, the invention provides golf footwear systems in which a sock and a shoe or an insole interact generally, as well as systems that specifically incorporate patterns of maximal stress. To maximize a consumer's ability to tune their footwear to their needs, the invention provides whole-footwear systems as well as shoes, socks, or shoe insoles that can be obtained separately and mixed-and-matched according to a golfer's judgment.

In certain aspects, the invention provides a golf footwear system that includes a shoe and a sock. The shoe has an insole with a plurality of features for padding and traction. The sock—generally including a cuff, a leg, an instep, a toe, a heel flap, and a sock sole, the sock sole having a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion—has a plurality of elements for padding and traction disposed on the sock sole in an arrangement corresponding to the arrangement of the plurality of features of the insole of the shoe. The arrangement may correspond to a template provided by measurements of stress exhibited by a golfer's foot during a swing. According to certain measured stress templates, the ball-of-foot portion, the outer arch portion, and the heel portion of the sole of the sock each have at least one padding element. Some templates may provide multiple elements for padding and traction (e.g., 2, 3, 4, many) for the ball-of-foot portion, the outer arch portion, or both. The elements may all be of uniform size. In some embodiments, an element on the heel is largest and an element on the outer arch portion is smallest. The sock sole may optionally include elements to correspond to an underside of a toe of a golfer. Elements for padding and traction may be located strictly on the downward facing area of the sock, or they may extend around up to the side of the sock.

Each of the elements on the sock sole may include an elastomer such as thermoplastic polyurethane (TPU), as may the features on the insole of the shoe. The elements may be a plurality of discrete elements of material adhered to the fabric of the sock, or may be singular areas of material.

In some embodiments, the elements on the sock and the features on the shoe each have a cross-sectional profile designed to interlock with the other to prevent relative lateral motion between the sock sole and the shoe in at least one direction, and optionally more than one, when the system is worn by a person.

In a related aspect, the invention provides a method of preventing fatigue while playing golf by dressing in a sock in which a sole of the sock has a plurality of elements for padding and traction and wearing a shoe having an insole with a plurality of features for padding and traction arranged to correspond to the elements. By hitting a golf ball with a golf club while wearing the footwear, consistent shooting is encouraged, in part because the elements of the sock may interlock with the features of the shoe insole to prevent the sock from slipping within the shoe.

Aspects of the invention also include a golf sock defining a cuff, a leg, an instep, a toe, a heel flap, and a sole. The sole includes a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion. The sole may further include one or more elements for padding and traction located according to a measured pattern of stress exhibited by a golfer's foot during a shot. For example, in some embodiments, the ball-of-foot portion includes a first element for padding and traction, the outer arch portion includes a second such element, and the heel portion includes a third such element. The elements may be of uniform size or the first element have a larger area than the second element while the third element has a larger area than the first element. In certain embodiments, the plurality of elements for padding and traction is disposed on the sole in an arrangement corresponding to a known arrangement of features on an insole of a pre-determined shoe.

In other aspects, the invention provides methods of making socks. Methods of the invention include receiving a template that shows a pattern corresponding to regions of maximal stress experienced on the sole of a golfer's foot during a golf swing and adding elements for padding and traction to the sole of a fabric sock according to the pattern. The method may further include making the sock for example, by knitting it. The elements may be added by screen-printing onto the fabric of the sock. An elastomer such as TPU or other material may be screen printed.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows an apparatus for measuring stress between a foot and ground.

FIG. 2 shows measured stresses between feet and ground during a golf swing.

FIG. 3 shows vectors of shear stresses between feet and ground during a golf swing.

FIG. 4 illustrates a sock of embodiments of the invention.

FIG. 5 depicts a socklet according to embodiments.

FIG. 6 is a diagram of regions of a sole.

FIG. 7 depicts a sole of a sock of the invention.

FIG. 8 shows a sole of a sock according to embodiments.

FIG. 9 illustrates a sock sole of the invention.

FIG. 10 shows a sock according to the invention.

FIG. 11 portrays a sock according to certain embodiments.

FIG. 12 exhibits a pair of socks according to embodiments of the invention.

FIG. 13 demonstrates a pair of socks according to certain embodiments.

FIG. 14 displays an exemplary pair of socks of the invention.

FIG. 15 reveals a pair of socks according to embodiments.

FIG. 16 is a reproduction of results of measuring sole stress during a golf swing.

FIG. 17 is a contour diagram of regions of stress shown in FIG. 16.

FIG. 18 is a flowchart of a method of improving a golfer's game.

FIG. 19 shows an exemplary system for improving a golfer's game.

FIG. 20 is a detailed diagram of regions of a sole.

DETAILED DESCRIPTION

Ground reaction forces and center of pressure patterns for a golfer's feet during a swing have previously been studied. See Williams, RELATIONSHIPS BETWEEN GROUND REACTION FORCES DURING THE GOLF SWING AND ABILITY LEVEL, 1999, Proc. 5th Eng. Sports Mtg., 7 pages. One application of the insights so gleaned involves studying how a shoe interacts with the ground. The interaction of the sole of the foot and the insole of the shoe can not best be addressed until the interaction of the outsole of the shoe and the ground is understood.

The physics of momentum transfer from golfer to ball is dependent on the relationship between the golfer and the ground. The stress/strain relationship between golfer and ground is mediated through at least three primary surface interfaces: the sole of the foot and the insole of a sock; the outsole of a sock and the insole of a shoe; and the outsole of the shoe and the ground. Before turning to phenomenon within the shoe, address first the shoe/ground relationship.

FIG. 1 shows a test apparatus 201 for measuring stress between a shoe and ground. Shoe 219 sits on turf 225. Tray 213 rests on a last inside of shoe 219 via post 231, all inside of sled 207. Casters 237 minimize friction between tray 213 and sled 207. Mass 209 simulates a golfer's downward force. Ground reaction forces (shear) and center of pressure forces can be measured using a force platform 227, such as one provided by Kistler (Winterthur, Switzerland). A golf stroke is mimicked by releasing weighted pendulum 241 so that the tip of the pendulum engages a loop on a cable thereby exhibiting a lateral impact force on sled 207.

Horizontal (Fy) and vertical (Fz) forces are measured as the force is applied until slip occurs. A traction score, T, is calculated as the peak horizontal force, at the instant a shoe slips, divided by vertical force.

When a variety of shoes were tested, a baseline Tmin is established using a smooth-sole non golf shoe and is used with a Tmax from the best shoe among the set to calculate a relative traction for the ith shoe based on the traction score Ti for the ith shoe.

Relative traction (%)=((Ti−Tmin)×100/(Tmax−Ti)  (Eq. 1)

In a test of leading brands of golf shoes, a shoe with 6 mm spikes gave Tmax, a Puma Tour gave the next best relative traction (99.7). The poorest, other than the smooth-soled shoe, was 74.2. Accordingly, a first step to minimizing variability or unpredictability of golf shots includes wearing a shoe with a good relative traction score. Once a golfer maximizes the relative traction between shoe and ground, for example, by wearing a Puma Tour shoe, methods of improving golf performance include optimizing interactions between the shoe and foot. Golf shoes are discussed in U.S. Pat. No. 6,817,117; U.S. Pat. No. 5,987,783; U.S. Pat. No. 5,761,833; and U.S. Pub. 2009/0100718, the contents of each of which are incorporated by reference.

Having now established a pattern of shoe/ground interaction and, more particularly, a test thereof that can be performed for any shoe, shoe/foot interactions are addressed. Any particular mechanism for affecting shoe/foot interactions may look to force patterns exhibited between the feet and the Earth during a swing.

FIG. 2 shows measured stresses between feet and ground during a golf swing. FIG. 2 gives a separate graph for the left and the right foot. Along the x-axis (time), start bar 305 indicates a position of a beginning of a downswing. Stroke bar 309 shows a moment of ball impact. In each graph, a box is drawn around a moment of maximum shear force, corresponding to pendulum impact of apparatus 201. Patterns that appear in FIG. 2 may be mapped onto the soles of feet or shoes.

FIG. 3 shows vectors of shear stresses between feet and ground during a golf swing, with each vector originating from a point of maximum vertical force (Fz). The points of maximum vertical force are drawn as small circles that are connected by a broad line that traces the progression of the maximum vertical force during a swing. Studying the vectors shown in FIG. 3, it can be understood that a left foot exhibits a maximum shear force in a nearly true heel-to-toe direction at a spot located at the center, forward part of a ball-of-foot region. In contrast, a right foot exhibits a maximum shear force in a direction from inside-toe to outside-heel, on a spot located at the inside, heel-ward part of a ball of the foot. The patterns revealed in FIG. 3 describe a significant stress phenomenon that a golfer contends with while making a shot.

Even with the best shoe (e.g., a Puma Tour), a golfer's foot will be pushed, relative to the insole of the shoe, according to the pattern of shear force vectors and center of pressure locations described in FIG. 3. Given that it is not a known practice to directly functionalize the human foot with cleats, it is an objective of the invention to functionalize the human foot with traction elements that resist the pattern shown.

An insight of the invention is that, while socks participate in two of the three body/ground interface surfaces, the fabric of socks can be exploited to attenuate body/ground slippage associated with shear forces as well as, simultaneously, discomfort associated with compressive forces. A footwear system with direct contact between elements on the outsole of a sock and an insole of a shoe may provide traction at both the interface between the sock outsole and shoe insole and the interface between the foot and the sock insole (e.g., due to the fabric pliability of the sock). Accordingly, the invention provides footwear systems, including individual socks, with one or more elements on the outsoles of socks that have an arrangement corresponding to a location of one or more of a maximum stress between a foot and the ground during a golf swing. Systems and articles of the invention generally include at least one sock.

FIG. 4 illustrates a sock 101 of embodiments of the invention. Sock 101 generally includes a cuff 107 at a terminus of leg portion 111. Leg portion 111 extends to instep 119, which terminates at toe region 123. Leg portion 111 also extends to heel flap 131. A sock sole 137 generally extends between heel flap 131, edges of instep 119, and toe 123. While sock 101 in FIG. 4 is drawn with lines appearing to set off heel flap 131, cuff 107, and toe 123, these portions of a sock need not be of separate material or separate pieces of material than the other parts of sock 101, and they need not correspond in size or shape to those areas shown in FIG. 4.

Sock 101 can be made from any suitable material and by any suitable method. Sock 101 can be manufactured by a machine, such as an industrial fabricator or a home knitting machine. Sock 101 may be made by sewing pieces of fabric together. In certain embodiments, sock 101 is knit using a circular knitting machine. The machine uses needles on a cylinder or double cylinder. As the cylinder rotates, the needles knit the yarn, creating a tube of sock with an open toe, which is then closed. A separate toe piece can be sewn on, or the toe can be sewn closed. The socks are optionally dyed or decorated or shaped on fiberboard forms. Methods for making socks are provided in U.S. Pat. No. 7,878,029; U.S. Pat. No. 7,047,767; U.S. Pat. No. 6,289,701; and U.S. Pub. 2012/0024014, the contents of which are incorporated by reference for all purposes.

In some embodiments, socks are obtained in which a fabric portion is pre-made substantially as shown in FIG. 4 or FIG. 5 and further functionalized according to methods of the invention.

A sock of the invention can be any suitable size, style, or material. Socks can be made of cotton, wool, acrylic, or any other natural or synthetic fiber. Socks can include nylon, polyester, rayon, or a combination of any of these materials. Socks can be foot-shaped or tube socks, and can have any thickness of material, overall length, or other dimensions. A sock can include a gusset at the area where heel flap, leg, and instep come together. Socks may extend above the knee, or at least cover the ankle, or not.

FIG. 5 depicts a socklet according to embodiments. A socklet is typically a sock that does not extend above the ankle. Some golfers may prefer a socklet for the stress-attenuation benefits of the invention while simultaneously having maximum exposure to outdoor air (e.g., on a hot day). Regardless of the length of a sock, the invention provides functionalization of a sole 137 of the sock. The invention includes the insight that different regions of a sole of a sock, as well as corresponding regions of an insole of a shoe, may each play a different role in the performance of a golfer's shot.

FIG. 6 is a diagram of regions of a sole 137. Sole 137 includes an inside toe region 141 and an outside toe region 146 just forward of a ball-of-foot region 151. There is an inside ball-of-foot region 169 disposed alongside an outside ball-of-foot region 157, as there is an inside mid-foot region 167 disposed along an outside mid-foot region 161. Distal to the toe area is a heel region 165.

The dashed lines in FIG. 6 do not necessarily show precise boundaries. A region is just an area of a sock, and one region may be deemed to overlap or extend into another. Any arbitrary area on a sock may be said to lie within a region if it overlaps that region and may be said to lie substantially within a region if a substantial portion of the area lies within the region. A region's boundary need not be thought of as a single clearly defined line, but may be understood more generally to be a transition zone. In certain embodiments, a sole 137 of a sock 101 is functionalized by the provision of a cushioning or traction element, which may be referred to as a padding element.

The invention provides socks and footwear systems in which a sole of a sock includes a padding element. A padding element is an element on a sole of a sock that affects the interplay between the foot and the insole of a shoe. Padding can mean cushioning, in one of its familiar senses. However, padding can be taken to have meanings that include the provision of displacement, as from a shim, or the provision of a foundation or support (e.g., analogous to the pouring of a concrete pad in construction). Padding may be taken to mean the provision of shape (e.g., as in a shoulder pad in a jacket), the provision of a feature for human contact (e.g., as in a keypad), the provision of a material for compressive impact or energy displacement (e.g., as in a drum pad), or a combination of any of the foregoing. For example, a pad may comprise a plurality of hard plastic areas, as does a keypad. In some embodiments, a pad includes or consists of a foam material (e.g., foam rubber) or an area in which a fabric is provided more thickly than in surrounding areas. In certain embodiments, a pad includes one or a plurality of areas of a polymer on the fabric of a sock. Pads can include one or more of a rubber, fabric, polymer, plastic, leather, wax, thread, fiber, paper, cardboard, or other material, in any combination.

A pad (e.g., polymer) may be infused into, or adhered onto, the fabric of a sock. A polymer may be so affixed only by its own material properties, or through the use of an adhesive or stitching. A polymer may be attached to fabric by any suitable method including gluing, stitching, printing, molding, melting, fusing, others, or a combination thereof. Any suitable polymer may be used including, for example, a polyurethane such as thermoplastic polyurethane. Methods of adding pads are discussed in U.S. Pat. No. 6,708,342; U.S. Pub. 2011/00233215; U.S. Pub. 2007/0204482; U.S. Pub. 2007/0028365; and U.S. Pub. 2005/0241186, the contents of which are incorporated by reference for all purposes. In general, at least one padding element will typically be included in sole 137 disposed, for example, at or near a location of maximal stress during a golf swing.

FIG. 7 depicts sole 137 of sock 101 according to certain embodiments of the invention. Sole 137 is shown here including ten of padding element 201 a, 201 b, . . . , 201 n. Each padding element 201 includes 18 spots of polymer affixed to sole 137. The 18 spots of an element 201 are disposed in a substantially hexagonal array. Where a padding element 201 includes a shape, a polygon, circle or ellipse, or irregular shape may be used. In some embodiments, a polygon is included due to, for example, the ability to provide edges that oppose the shear force. An edge of padding element 201 may provide particular traction in a direction perpendicular to an edge. A direction of traction may be viewed as a vector, with components in directions other than the vector. For any shear force, two non-parallel edges of a polygon will provide at least one component of a vector of traction that is antiparallel to the vector of shear force. In some embodiments, the strongest traction vector is associated with the edge most nearly perpendicular to the shear force vector. For a series of shear forces oriented in different directions, or for one shear force that will be oriented in an unpredictable direction, the more sides a polygon has, the greater probability that it will present at least one edge at less than some arbitrary maximum deviation from the direction perpendicular to the shear force(s). Accordingly, hexagons may generally provide more traction than pentagons and squares, etc. Note that in alternative embodiments, maximum traction may not be associated with an edge of a polygon, but may be associated with a material of element 201, and amount of vertical relief, a material of an insole of a shoe, other factors, or a combination thereof.

Where element 201 has a shape of a polygon, it may be preferred to use a polygon or combination of polygons that tessellate or exhibit efficient packing. Packing of polygons may be taken to mean a ratio of area enclosed by a polygon to a ratio of total area when a pattern of polygons is arranged to maximize that ratio. Efficient packing may then refer to the minimizing of interstitial “space” between polygons. Fully tessellating regular polygons include isosceles triangles, rectangles, and hexagons. In some embodiments, a hexagon is used to have a fully tessellating form with edges in a desired number of directions. In alternative embodiments, it may be desired to optimize an edge to area ratio (e.g., to maximize it), and another form (e.g., isosceles triangle or square) may be used. Furthermore, a particular shape (e.g., such as a given overall shape) may be desired to optimize an aspect of a manufacturing process. For example, where elements 201 are manufactured separately from sock 201 and then adhered thereto, elements 201 may be manufactured in a sheet form, for example, as a material adhered to a paper substrate. Accordingly, it may be desired to use a shape with arbitrarily high packing efficiency or tessellation to minimize waste of the sheet. As shown in FIG. 7, elements 201 have a hexagonal overall shape, and are presented in three different sizes. Other patterns are within the scope of the invention. It will be noted that sole 137 depicted in FIG. 7 appears as the sole of one foot. A sock 101 of the invention may be provided as a pair, and in some embodiments, the pair of socks has a symmetrical pattern of elements 201 (one sock is the mirror image of the other). In certain embodiments, a pattern of elements 201 on the soles 137 of a pair of socks in asymmetrical. In other embodiments, only one sock of a pair has elements 101. Any exemplary sock herein may be taken to show a pair where the other sock may be the symmetrical match to the depicted sock. Additionally, any two socks depicted herein may be taken to form a pair. In some embodiments, the invention provides a pair of socks in which one sock has one of the patterns shown or discussed herein, or a variant thereof, and the other sock as a related but non-matching pattern, such as the inclusion of at least one matching element but in a non-corresponding location.

FIG. 8 shows a sole 137 that is similar to the sole shown in FIG. 7 but without elements 201 disposed at the toe area. It can be noted in FIGS. 7 and 8 that elements 201 are presented in at least three different sizes. The medium size is shown at interior ball-of-foot region 169, an element of large size is shown at heel region 165, and at least one small element 201 is depicted in outside mid-foot region 161. In some embodiments, this pattern is preferable as a heel needs a large element 201 for comfort and weigh distribution while interior ball-of-foot region 169 needs a compact but substantially effective element 201. An outside mid-foot region 161 is an optional location for an element 201.

FIG. 9 illustrates a sole 137 that includes irregularly-shaped elements 201. Here, the shape, size, and thickness (including optionally variations in thickness) of elements 201 are shown provided in a fashion that can correspond with great precision to regions of maximal stress.

FIGS. 10 and 11 show exemplary socks according to the invention. Sock 101 can include features known in socks, such as toe, heel flap, or both being provided in another material or color. Socks 101 can include printed information, for example, relating to the benefits of elements 201. Printed information can provide a significant utilitarian benefit. One or more indicia printed on a sock can direct a golfer in proper use of the footwear system. By using graphics, text, layout, or a combination thereof, to communicate the benefits of the elements for padding and traction, provide information concerning proper use, or both, printed indicia may enhance a golfer's benefit from use of the invention. Useful printed indicia can include indications of locations of elements 201, information about a corresponding insole, sock size or foot (e.g., L v R), a wear indicator, or simply a brand name or statement of the function of the sock or footwear system.

As shown in FIGS. 10 and 11, elements 201 may have an overall shape (here, square) of one material, with additional features therein or thereon. Here, each square of element 201 includes a hexagonal pattern of spots of material. This may be preferred where, for example, sock 101 and element 201 are manufactured separately and then elements 201 are affixed to sock 101. Other shapes and patterns of elements 201 are provided.

FIG. 12 shows a pair of socks in which elements 201 are provided as localized regions of gripping dots including a material such as TPU.

In certain aspects, the invention provides a footwear system in which a sock 101 has an element 201 on a sole of the sock and the system further includes an insole of a shoe with a feature in a corresponding location. Such a system provides the particular benefit of locking a golfer's foot to the foot-bed of their shoe. When used in conjunction with a shoe that scores acceptably on the stress test described above, excellent locking between a golfer's foot and the ground is achieved. Accordingly, the invention provides methods of improving one's game by using a sock with a padding element and a shoe with an insole with an interacting feature in a corresponding location. The elements on the sock and on the insole of the shoe interact for maximum comfort, grip, or both. Systems of the invention can include shoes that have features corresponding the elements 201 on sole 137 of sock 101. In certain embodiments, the invention provides insoles for shoes wherein the insoles have the features. Thus a golfer may procure functionalized shoes and socks, or functionalized insoles and socks, and insert the insoles into their golf shoes to obtain the benefits of the invention. Insoles may optionally include a mechanism for fixing them into the foot-bed of shoes such as, for example, an adhesive backing.

By providing insoles that interact with socks 101, systems and methods of the invention optimize a golfer's shot. The features on the insoles of the shoes can have a profile that complements elements 201 on socks 101. For example, elements 201 can be gripping dots, and the insoles can have pockets. In some embodiments, elements 201 are textured areas for high friction and the insoles feature complementary textured areas or rubber areas.

FIG. 13 shows a pair of socks 101 in which elements 201 are included having a linear pattern. Each element 201 may be provided with a series of ridges and valleys, which can be straight (as shown in FIG. 13), sinuous, curved, zigzag, irregular, etc. In some aspects,

In certain embodiments, elements 201 include ridge-and-valley structures and the insoles are provided with corresponding ridge-and-valley structures. When the ridge-and-valley elements 201 of socks 101 mate with the structured insoles, shear motion perpendicular to the ridgelines is prevented. Moreover, by providing a padding element of a deformable material (e.g., polyurethane), a cushioning aspect is provided.

In certain embodiments, a padding element 201 (e.g., as shown in FIG. 13) may have a ridge-line or edge that is substantially perpendicular to vector of maximum shear stress (e.g., as shown in FIG. 3). A sole 137 may include a plurality of such elements 201, in which each element includes an edge or contour that is substantially perpendicular to a corresponding vector. In some embodiments, each dot (e.g., at the origin of each vector) shown in FIG. 3 corresponds substantially to a geometric center of gravity of an element 201 on a sole 137 of a sock 101, and each element 201 has a linear component oriented normal to the corresponding vector. The invention also includes footwear systems in which an insole of a shoe includes features with linear elements that correspond to, and interlock with, elements 201.

According, in some embodiments, FIG. 13 shows elements 201 having ridge-and-valley structures. The invention also provides insoles with corresponding structures. The ridges may be oriented so that ridgelines run substantially perpendicular to a vector of maximal shear stress. A sole 137 may include a large element 201, for example, at the ball-of-foot region. To supplement the shear resistance of the ridgelines, sole 137 may include other elements 201 having ridgelines that run in other directions, as shown in FIG. 13. While depicted in FIG. 13 as being approximately symmetric, a pattern of elements need not be. In fact, in some embodiments, only one sock of a pair includes one or more of element 201.

FIG. 14 displays an exemplary pair of socks 101 in which only one sock includes elements 201. Here, element 201 is depicted as a pattern of ten triangles. Where only one sock include element 201, it may be either sock of a pair. A golfer may prefer element 201 on a dominant foot.

An element 201 as depicted in any figure herein, or as discussed herein, may include an amount of relief. Relief, generally, is a measure of an amount of thickness added to fabric by virtue of a thickness of element 201. An element 201 may have 0 (zero) relief by being printed substantially smoothly on the fabric (as type is typically printed on a page). An element 201 may have uniform relief, indicating a generally planar surface with a contour that mimics the contour of a surface of sock 101 (and therefore a contour of a foot). An element 201 may have varying relief, such as is provided by a rippled, textured, sloped, beveled, or contoured surface. An amount of relief at any given point may be zero, or it may be between 0.001 mm and 1 cm. In certain embodiments, an amount of relief is between about 0.5 mm and about 3 mm (e.g., between about 0.7 mm and about 1.5 mm).

FIG. 15 shows a pair of socks 101 according to certain embodiments in which element 201 is a hexagonal ring with a vacant area in the middle of about a quarter of the area of the overall hexagon. While depicted here as only being on sock, a pair of socks may be provided in which both include element 201. A location or distribution of elements may be determined with reference to information about ground stresses on a golfer.

The invention includes methods of making socks for improved golfing by using information about ground stress. Ground stress information may be had by performing tests on a golfer, or by reference to available information. In the context of footwear systems of the invention, a pattern of ground stress information may be used as a template for making socks. Methods of the invention include receiving a template that shows a pattern corresponding to regions of maximal stress experienced on the sole of a golfer's foot during a golf swing and adding padding elements 201 to the sole of a fabric sock 101 according to the pattern.

FIG. 16 is a reproduction of results of measuring sole stress during a golf swing. The results depicted in FIG. 16 were originally presented in color. For the purposes of preparing a template for making socks, color data may be reformatted as black and white.

FIG. 17 is a contour diagram of regions of stress shown in FIG. 16. As shown in FIG. 17, black regions correspond to what were red regions of the display shown in FIG. 16. White areas immediately adjacent to the black areas correspond to, and may be pictured as, orange. Gray zones (in FIG. 17) were depicted as yellow zones in FIG. 16 and the outer white zones may be pictured as green. Striped zones correspond to blue zones. In this manner, the color spectrum in FIG. 16 that stood for a measure of stress intensity can processed as specific areas. Any suitable image processing operation may be used. In certain embodiments, a morphological processing operation—such as erosion, dilation, others, or a combination thereof—may be used to prepare a template such as the one depicted in FIG. 17. Known computer programs can generate color separations. See, for example, Markham, CMYK COLOR SEPARATIONS USING THE GIMP, accessed on Nov. 1, 2011, from the web site Alternative Photography. One benefit of a template such as FIG. 17 or a color separation of data such as that shown in FIG. 16 (noting that a color separation is, by nature, a black and white image) is that it itself may be used as camera-ready art in the preparation of silk screens for printing TPU elements onto socks. That is, in certain embodiments, the template dictates the positioning of elements 201 on socks 101. In some embodiments, such a template is used to determine where to locate elements 201 on socks 101. A template can be any information that relates areas of stress during a golfer's swing and can have any suitable format. For example, a template may consist of numerical coordinates indicating locations on soles and values that indicate stress by magnitude, vector, or both.

FIG. 18 diagrams a method of improving a golfer's game. Steps of methods of the invention can be performed in any suitable order. FIG. 18 provides but one exemplary diagram. A template, as discussed above, is obtained along with any parameters relating to footwear. For example, where socks are to be manufactured, an order of socks and parameters relating to color, decoration, size, etc., may be received. Where a footwear system (e.g., a single custom system for a golfer) is to provided, information about a preferred shoe may be received. Footwear is then prepared. This can include making socks and/or mounting them on some suitable frame. Elements 201 are then added to the socks. In certain embodiments, this involves screen printing TPU onto sock fabric. Any required details (e.g., cuff-stitching, printing of size information, monogramming) are added. In contexts that involve customization or personalization, relevant details are prepared. For example, a golfer may provide a personalized template for locations of elements 201. In some embodiments, a golfer is given choice of different styles of elements 201. In embodiments in which a footwear system is being provided, an insole is provided, either as part of a shoe, or for inserting into a shoe. Once the sock and optional insole is prepared it is delivered. For example, a shipment of socks can be delivered to a truck, to be carried to a distribution center. Or a customer's online order can be shipped to their home.

FIG. 19 shows an exemplary system for improving a golfer's game. In some aspects, the invention provides a system for making a sock that provides the ability to receive a template that shows a pattern corresponding to regions of maximal stress (e.g., FIG. 3, FIG. 8, FIG. 9, FIG. 17, etc.) and to coordinate operations for adding elements for padding and traction to a sock according to the pattern.

FIG. 19 shows components in an exemplary system for producing footwear systems. As shown in FIG. 19, system 400 generally includes one or more computer, communicably coupled via network 415. Systems and methods of the invention may generally be implemented through the use of one or more computer such as any combination of a provider computer 481, a production computer 461, and a consumer computer 401 along with, for example, a sales server 441 and a production server 421. A computer generally includes a processor (e.g., 409, 489, 469, 449, 429) operably coupled to a memory (e.g., 407, 487, 467, 447, 427) and configured to send or receive information via input-output device (e.g., 405, 485, 465, 445, 425).

One of skill in the art will recognize that a processor may be provided by one or more processors including, for example, one or more of a single core or multi-core processor (e.g., AMD Phenom II X2, Intel Core Duo, AMD Phenom II X4, Intel Core i5, Intel Core i& Extreme Edition 980X, or Intel Xeon E7-2820). In certain embodiments, any of consumer computer 401, provider computer 481, production computer 461 may be a notebook or desktop computer sold by Apple (Cupertino, Calif.) or a desktop, laptop, or similar PC-compatible computer such as a Dell Latitude E6520 PC laptop available from Dell Inc. (Round Rock, Tex.). Such a computer will typically include a suitable operating system such as, for example, Windows 7, Windows 8, Windows XP, all from Microsoft (Redmond, Wash.), OS X from Apple (Cupertino, Calif.), or Ubuntu Linux from Canonical Group Limited (London, UK). In some embodiments, any of consumer computer 401, provider computer 481, production computer 461 may be a tablet or smart-phone form factor device and processor 481 can be provided by, for example, an ARM-based system-on-a-chip (SoC) processor such as the 1.2 GHz dual-core Exynos SoC processor from Samsung Electronics (Samsung Town, Seoul, South Korea).

In some embodiments, either of sales server 441 or production server 421 can be a Hitachi Compute Blade 500 computer device sold by Hitachi Data Systems (Santa Clara, Calif.). Either of processor 449 or processor 429 can be, for example, a E5-2600 processor sold under the trademark Xeon by Intel Corporation (Santa Clara, Calif.).

Input-output devices generally includes one or a combination of monitor, keyboard, mouse, data jack (e.g., Ethernet port, modem jack, HDMI port, mini-HDMI port, USB port), Wi-Fi card, touchscreen (e.g., CRT, LCD, LED, AMOLED, Super AMOLED), pointing device, trackpad, microphone, speaker, light (e.g., LED), or light/image projection device.

In certain embodiments, a template is received via a consumer's use of consumer computer 401 or via a designer's use of provider computer 481 and the selection is received at sales server 441 and stored in memory 447. Sales server 441 may use a network card for input/output 445 to received data. Sales server 441 may provide an order database 443 which may include accounts 444 where consumer information is stored (e.g., for payment and delivery information).

After orders are received and ready for production, one or more templates, other order information, or a combination thereof can be transferred via input/output 445 from sales server 441 to production server 421 via input/output 425, which may also be a network card or other data transfer mechanism. Order information (e.g., orders 439) is stored in production database 435 in memory 427. Processor 429 executes computer program instructions stored in memory 427 to initiate production.

A production facility may be equipped with a production computer 461 which either automatically coordinates the operation of machines or provides information to production employees, e.g., via input/output 465, which could include, for example, a monitor or laser printer.

Many of the steps and functions described herein can be planned or coordinated by a provider personnel using provider computer 481. For example, engineers or sales personnel can prepare and upload information (e.g., one or more template, digital files such as in a comma-separated values (CSV) format). That is, in certain embodiments, provider personnel use provider computer 481 to design or plan production of particular socks or footwear systems.

A memory generally refers to one or more storage devices for storing data or carrying information, e.g., semiconductor, magnetic, magneto-optical disks, or optical disks. In certain embodiments, a storage device of the invention includes a tangible, non-transitory computer readable medium for memory. Exemplary devices for use as memory include semiconductor memory devices, (e.g., EPROM, EEPROM, solid state drive (SSD), and flash memory devices e.g., SD, micro SD, SDXC, SDIO, SDHC cards); magnetic disks, (e.g., internal hard disks or removable disks); magneto-optical disks; and optical disks (e.g., CD and DVD disks). The processor and the memory can be supplemented by, or incorporated in, special purpose logic circuitry.

Footwear systems and articles of the invention may be made with reference to particular portions of a sole of a foot, sock, or insole. FIG. 6 displayed regions of a sole. In some embodiments, elements or features are located on a sole with more particular reference to detailed specific regions of a sole.

FIG. 20 is a detailed diagram of specific regions of a sole 137. Sole 137 includes an inside toe region 141 and an outside toe region 145 just forward of a ball-of-foot region 151. A shared central toe portion 177 occupies parts of inside toe region 141 and outside toe region 145. There is an inside ball-of-foot region 169 disposed alongside an outside ball-of-foot region 157, both in connection with fore-central ball-of-foot region 175. There is an outer-edge ball-of-foot region 153. Sole 137 further includes an inside mid-foot region 167 disposed along an outside mid-foot region 161. Outside mid-foot region 161 is lead by forward outside mid-foot area 159 and trailed by trailing outside mid-foot area 163. Heel region 165 is lead by forward heel region 155 and trailed by trailing heel region 173. In certain embodiments, a sock 101 or insole of the invention comprises an element 201 or feature, respectively, substantially or essentially contiguous with central toe portion 177, fore-central ball-of-foot region 175, forward outside mid-foot area 159, forward heel region 155, or a combination thereof. In some embodiments, a sock 101 or insole of the invention comprises an element 201 or feature, respectively, substantially or essentially contiguous with central toe portion 177, fore-central ball-of-foot region 175, forward outside mid-foot area 159, and forward heel region 155, as depicted in FIG. 20, as this may provide enhanced benefits of improved golfing according to insights of the invention.

In certain embodiments, a pair of socks of the invention includes elements 201 at locations corresponding to the origins of one or more of the vectors depicted in FIG. 3. For example—making reference to FIG. 20, and imaging its mirror image to visualize both a left and a right sock 101—in some embodiments, a right sock includes an element 201 at each of inside ball-of-foot region 169, fore-central ball-of-foot region 175, and outside ball-of-foot region 157, or a continuous element 201 across a corresponding area (optionally including element 201 at outer-edge ball-of-foot region 153 for additional lateral support benefit). A left sock includes an element 201 at each of fore-central ball-of-foot region 175, outside ball-of-foot region 157, and forward outside mid-foot area 159, or a continuous element 201 disposed across a corresponding area. In certain alternative embodiments, the left and the right sock are substantially symmetric to one another to offer a benefit to consumers of matched feel for certain consumer who may find asymmetric socks a distraction. In some embodiments, the invention provides insoles with corresponding features. The features and elements may be designed to provide a high degree of traction to resist lateral displacement that would result from unmitigated shear stresses. Displacement-resistance can be provided by a textured surface, a pliable material (e.g., TPU), ridgelines or contours, edges, corresponding protrusions and divots, gripping balls, nubbins, or combinations thereof. Additionally, in some embodiments, one or more of element 201 may wrap from the sole, outwards and upwards, extending to the sides of sock 101 (e.g., towards the instep 119) for the benefit of additional tactile feedback. While discussed above in terms generally of traction and cushioning (e.g., to offset stresses and prevent fatigue, which reduces subconscious foot positioning), additional benefits include tactile feedback. The inclusion of one or more of element 201 give stimulus points by which a golfer may understand the positioning of the foot in relationship to the shoe and the ground, thereby aiding a golfer in continually improving their athletic ability.

As used herein, the word “or” means “and or or”, sometimes seen or referred to as “and/or”, unless indicated otherwise.

INCORPORATION BY REFERENCE

References and citations to other documents, such as patents, patent applications, patent publications, journals, books, papers, web contents, have been made throughout this disclosure. All such documents are hereby incorporated herein by reference in their entirety for all purposes.

EQUIVALENTS

Various modifications of the invention and many further embodiments thereof, in addition to those shown and described herein, will become apparent to those skilled in the art from the full contents of this document, including references to the scientific and patent literature cited herein. The subject matter herein contains important information, exemplification and guidance that can be adapted to the practice of this invention in its various embodiments and equivalents thereof. 

What is claimed is:
 1. A golf footwear system comprising: a shoe having an insole comprising a plurality of features for traction and padding; and a sock comprising a cuff, a leg, an instep, a toe, a heel flap, and a sock sole, the sock sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion, wherein the sock further comprises a plurality of elements for traction and padding disposed on the sock sole in an arrangement corresponding to an arrangement of the plurality of features of the insole of the shoe.
 2. The system of claim 1, further wherein each of the elements comprises an elastomer.
 3. The system of claim 2, wherein the features comprise the elastomer.
 4. The system of claim 3, wherein the elastomer is thermoplastic polyurethane.
 5. The system of claim 1, wherein the elements and the features each comprise a cross-sectional profile designed to interlock with the other to prevent relative lateral motion between the sock sole and the shoe in at least one direction when the system is worn by a person.
 6. The system of claim 5, wherein relative lateral motion is prevented in a plurality of directions when the system is worn by a person.
 7. The system of claim 1, further wherein: the ball-of-foot portion comprises a first element; the outer arch portion comprises a second element; and the heel portion comprises a third element.
 8. The system of claim 7, wherein the first element has a larger area than the second element and the third element has a larger area than the first element.
 9. The system of claim 7, further wherein: the ball-of-foot portion comprises the first and a fourth element; and the outer arch portion comprises the second and a fifth element.
 10. The system of claim 1, wherein each element comprises a plurality of areas of material adhered to a fabric of the sock.
 11. A method of preventing fatigue while playing golf, the method comprising: dressing in a sock comprising a cuff, a leg, an instep, a toe, a heel flap, and a sock sole, the sock sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion, and a plurality of elements for padding and traction; wearing a shoe having an insole comprising a plurality of features for padding and traction arranged to correspond to the elements; and hitting a golf ball with a golf club.
 12. The method of claim 11, wherein the elements of the sock interlock with the features of the shoe insole to prevent the sock from slipping within the shoe.
 13. A golf sock comprising: a cuff, a leg, an instep, a toe, a heel flap, and a sole, the sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion, wherein the ball-of-foot portion comprises a first element for traction and padding; the outer arch portion comprises a second element for traction and padding; and the heel portion comprises a third element for padding and traction.
 14. The sock of claim 13, wherein the first padding element has a larger area than the second padding element and the third padding element has a larger area than the first padding element.
 15. The sock of claim 13, further wherein: the ball-of-foot portion comprises the first and a fourth element for traction and padding; and the outer arch portion comprises the second and a fifth element for traction and padding.
 16. The sock of claim 13, further wherein a pattern of the elements corresponds to points on a golfer's foot associated with maximal stress during a golf swing.
 17. A golf sock comprising: a cuff, a leg, an instep, a toe, a heel flap, and a sole, the sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion; and a plurality of elements for padding and traction disposed on the sole in an arrangement corresponding to points on a golfer's foot associated with maximal stress during a golf swing.
 18. A golf sock comprising: a cuff, a leg, an instep, a toe, a heel flap, and a sole, the sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion; and a plurality of elements for padding and traction disposed on the sole in an arrangement corresponding to a known arrangement of features on an insole of a pre-determined shoe.
 19. A method of making a sock, the method comprising: receiving a template that shows a pattern corresponding to regions of maximal stress experienced on the sole of a golfer's foot during a golf swing; obtaining a fabric sock comprising a cuff, a leg, an instep, a toe, a heel flap, and a sole, the sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion; and adding elements for padding and traction to the sole according to the pattern.
 20. The method of claim 19, further wherein obtaining the fabric sock comprises making the sock.
 21. The method of claim 20, wherein making the sock comprises knitting.
 22. The method of claim 19, wherein adding the elements comprises screen-printing on the fabric sock.
 23. The method of claim 22, wherein screen printing comprises printing thermoplastic polyurethane onto the fabric sock.
 24. A pair of socks for golf comprising: a first sock comprising a cuff, a leg, an instep, a toe, a heel flap, and a sole, the sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion; a first element for traction and padding disposed on the sole the first sock in a location corresponding to a point on a golfer's foot associated with maximal stress during a golf swing; and a second sock.
 25. The pair of socks of claim 24, further wherein the second sock comprises a second element for padding and traction disposed on a sole of the second socks.
 26. The pair of socks of claim 25, wherein a location of the second element is not symmetric with the location of the first padding element.
 27. The pair of socks of claim 24, wherein the first element comprises a first layer of a material bonded to a fabric of the sock and a second layer of a second material bonded to the first layer of material.
 28. The pair of socks of claim 25, wherein each element comprises a first layer of a material bonded to a fabric of the sock and a second layer of a second material bonded to the first layer of material.
 29. A golf footwear system comprising: a pair of shoes, each shoe having an insole, wherein a first one of the insoles comprises a feature for padding and traction; and a pair of socks, each sock comprising a cuff, a leg, an instep, a toe, a heel flap, and a sock sole, the sock sole comprising a ball-of-foot portion, an inner arch portion, an outer arch portion, and a heel portion, wherein a first one of the pair of socks further comprises an element for padding and traction disposed on the sole thereof in a location corresponding to a location of the feature of the insole of the shoe.
 30. The golf foot footwear system of claim 29, further wherein each of the socks has an element for padding and traction disposed on the sole thereof, and each of the insoles has a corresponding feature for padding and traction.
 31. The golf footwear system of claim 30, further wherein a location of the element on one sock is not a mirror image of a location of the element on the other sock.
 32. The golf footwear system of claim 30, further wherein each of the socks has a plurality of the elements disposed on the sole thereof, and each of the insoles has a plurality of the corresponding features.
 32. The golf footwear system of claim 32, further wherein an arrangement of the plurality of the elements on one sock is not a mirror image of an arrangement of the plurality of elements on the other sock.
 33. A method of improving a golfer's playing ability, the method comprising: receiving, at a computer system comprising a memory coupled to a processor, data describing a pattern of stress exhibited by a sole of a foot during a golf swing; preparing a sock comprising an instep portion, a toe portion, a heel portion, and a sole portion, wherein the sole portion comprises an element for padding and traction; and providing the sock to a golfer.
 34. The method of claim 33, wherein the data is received from the golfer.
 35. The method of claim 33, further comprising preparing and providing a pair of socks, each having a sole portion.
 36. The method of claim 35, wherein the socks are not matched due to differences in patterns on the sole portions.
 37. A method to improve a golfer's golfing ability, the method comprising: analyzing, using a computer, stress pattern data exhibited by a sole of a foot of the golfer during a golf swing; preparing, using the stress pattern data, a template comprising a location of maximal stress exhibited by the sole during the golf swing; and preparing footwear comprising a sock with a sole with at least one element for padding and traction disposed on the sole in the location of maximal stress.
 38. The method of claim 37, wherein the location of maximal stress is an area of about 1 cm2 that includes a spot on the sole where at least 85% of a maximum stress is exhibited during the golf swing.
 39. The method of claim 37, wherein preparing the template comprises printing on a sheet of paper.
 40. The method of claim 37, wherein preparing the template comprises receiving data from a golfer obtained through the golfer's use of a personal computer and storing the data in a server computer. 